<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>天气案例</title>
    <script type="text/javascript" src="../js/vue.js"></script>
</head>
<body>
     <!--准备好一个容器-->
     <div id="root">
           <h2>今天天气很{{info}}</h2>
           <button @click="changeWeather">切换天气</button>
     </div>
</body>
  <script>
    Vue.config.productionTip = false //阻止 vue 在启动时生成生产提示。

     const vm =  new Vue({
        el:'#root',
        data:{
            isHot:true,
        },
        computed:{
          info(){
            return this.isHot? '炎热':'凉爽'
          }
        },
        methods:{
            changeWeather(){
              this.isHot = !this.isHot
            }
        },
      })
  </script>
</html>